Mercury - Quicksilver Replacement Water Pump Kit 9-Piece Cooling System Service Set 803750A03. Overview. Keep your outboard running cool and dependable with the Mercury Marine 803750A03 Quicksilver Replacement Water Pump Kit. This 9-piece OEM-quality kit provides all the components you need to restore proper cooling flow, including the water pump housing, impeller, plate, and water guide tube. Designed for 2005 and newer Mercury and Mariner 8-9.9HP 4-Stroke outboards, it ensures your engine's co